Method for treating wastewater of dilute thiamine containing acrylonitrile

A treatment method and technology of acrylonitrile, applied in water/sewage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problem of low quality of ammonium sulfate recovery, solid waste and organic nitrile impurities It is difficult to solve the problems of low concentration of ammonium sulfate, etc., to achieve the effect of quality improvement, recovery quality improvement, and good technical effect.

Active Publication Date: 2007-12-26
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the prior art, there are many solid wastes and organic nitrile impurities in the waste water, the low concentration of ammonium sulfate is difficult to recycle and the technical problem of reclaiming ammonium sulfate is not high, and a new acrylonitrile-containing dilute sulfur is provided. Treatment method of ammonium wastewater

Method used

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  • Method for treating wastewater of dilute thiamine containing acrylonitrile

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Embodiment 1

[0021]Adopt the technical process of Fig. 1, the weight percent of one-stage method acrylonitrile quenching dilute ammonium sulphate waste water is composed of: acrylonitrile 0.19%, hydrocyanic acid 0.19%, water 78.36%, ammonium sulphate 13.82%, polymer 7.44%, wherein also contains A small amount of catalyst dust. After the waste water is separated from the solid and liquid by the hydrocyclone, the catalyst dust and most of the polymers are removed, and the mass composition of acrylonitrile 0.20%, hydrocyanic acid 0.20%, water 84.67%, ammonium sulfate 14.93% and trace polymers are obtained. liquid and adjust its pH value to 6.6, the clear liquid is separated by 20 theoretical plate rectification towers, the rectification tower top temperature is 85.2 ℃, and under the condition of tower still temperature 110 ℃, the total weight of 2% raw materials at the top of the tower is obtained. The weight composition is an organic solution of 40% of hydrocyanic acid, 35% of acrylonitrile,...

Embodiment 2

[0023] Adopt the same flow process and condition of embodiment 1, just change the theoretical plate number of rectifying tower to be 30, the tower still temperature of rectifying tower is 115 ℃, and the ammonium sulfate solution is taken out from the side line at the 4th tray place on the upper part of the tower still , take out the organic solution from the side line at the 7th tray at the lower part of the tower top, and adjust the pH value of the clear liquid after removing solid impurities to 7.5. Obtaining the organic solution that the tower top weight is composed of 43% of hydrocyanic acid, 40% of acrylonitrile, water 17%, the 3rd tray side line extraction of tower top lower part is the aqueous solution containing 0.01% acrylonitrile, the 4th block of tower still top The 25% ammonium sulfate solution is extracted from the side line of the tray, and the tower still flows out 10% raw material weight containing polymer-containing ammonium sulfate solution.

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Abstract

This invention relates to a method for treating diluted ammonium sulfate wastewater containing propionitrile. The method solves the problems of high solid waste and organic nitrile impurity contents, low ammonium sulfate concentration, difficult ammonium sulfate recovery, and low recovered ammonium sulfate quality. The method comprises: (1) removing solid impurities from diluted ammonium sulfate wastewater containing propionitrile, and adjusting the pH value to 6.5-7.5 to obtain material flow 1; (2) sending material flow 1 into a liquid-gas separator, and performing stripping or rectification; (3) removing lightweight organic fractions at the overhead of the liquid-gas separator, collecting polymer fractions at the bottom, extracting the rest wastewater at 1st-5th theoretical plates from the overhead to obtain material flow 2, extracting water free of solids and organic matters from 1st-10th theoretical plates from the bottom to obtain material flow 3, mixing material flow 3 with water added by the quenching system and diluted acid, circulating to the quenching column, and recovering ammonium sulfate from material flow 2.

Description

technical field [0001] The invention relates to a treatment method for wastewater containing acrylonitrile dilute ammonium sulfate. Background technique [0002] Most of the acrylonitrile production units in the world adopt the Schoio process of BP Company, and its market share reaches more than 95%. The process uses chemical grade propylene, fertilizer grade ammonia and air as raw materials (propylene in the feed: ammonia: air = 1: 1.2: 10), uses phosphorus-molybdenum-bismuth catalysts to produce acrylonitrile, and simultaneously produces acetonitrile and hydrogen. cyanic acid. The reactor is a fluidized bed, the reaction temperature is 400-500°C, and the pressure is 0.05-0.1MPa. [0003] The refining recovery process of acrylonitrile has an important influence on the product yield of acrylonitrile unit. Generally, the recovery and refining process in the acrylonitrile plant is as follows: the reaction mixture from the reactor is cooled to about 200 ° C by the after-reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66C02F1/04C02F1/58
Inventor 肖剑钟禄平陈秀宏
Owner CHINA PETROLEUM & CHEM CORP
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